Here's the shaft flex you should play based on your swing speed
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Steadfast Carbon Fiber Driver Shaft - Carbon Fiber Golf Shaft with Standard 45.5" Play Length - 4 Flex Choices - Adapter Included - Installed Professional Club Fitting Team (Regular, COBRA)
Club Fitting 101 – Ted & Dave Custom Golf
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Golf Shafts – Fitting and Flex Explained – Golfballs.com
KBS Golf Shafts på Twitter: "@KBSGolfShafts Find Your Fit in 2018 w/ the NEW KBS Golf Shafts Find Your Fit #Redlabel to find the right golf shaft & change your game today